3Com Switch 8800 Configuration Guide Chapter 37 BGP/MPLS VPN Configuration37-77[CE1-ospf-100-area-0.0.0.0] network 12.1.1.0 0.0.0.2554) Configure CE2Configure interface.[CE2] vlan 202[CE2-vlan202] port gigabitethernet 2/1/2[CE2-vlan202] quit[CE2] interface Vlan-interface 202[CE2-Vlan-interface202] ip address 12.1.1.2 255.255.255.0[CE2-Vlan-interface202] ospf cost 100[CE2-Vlan-interface202] quit[CE2] vlan 201[CE2-vlan201] port gigabitethernet 2/1/1[CE2-vlan201] quit[CE2] interface Vlan-interface 201[CE2-Vlan-interface201] ip address 20.1.1.1 255.255.255.0[CE2-Vlan-interface201] ospf cost 1Configure OSPF.[CE2] ospf 100 router-id 20.20.20.20[CE2-ospf-100] area 0.0.0.0[CE2-ospf-100-area-0.0.0.0] network 12.1.1.0 0.0.0.255[CE2-ospf-100-area-0.0.0.0] network 20.1.1.0 0.0.0.25537.4.10 Nested BGP/MPLS VPN Configuration ExampleI. Network requirementsA VPN user has multiple nodes to access the service provider's BGP/MPLS backbonenetwork. And this VPN is divided into three sub-VPNs: VPN1, VPN2 and VPN3.Some of the nodes of these sub-VPNs directly access a PE in the network, and someaccess a PE through the father VPN. That is, the adopted network structure isunsymmetrical.This example mainly describes the configuration of VPN1; the configuration of othersub-VPNs is similar.
